Muffler for engines



A. T. FLOYD, JR

MUFFLER FOR ENGINES Filed Jan.

Aug. 11, 1931.

Patented Aug. 1, 1931 UNITED STATES PATENT OFFICE ALFRED T. FLOYD, JR, OF LITTLE ROCK, ARKANSAS, ASSIGNOR OF FORTY-NINE PER CENT TO ELMER It. SCOTT, OF LITTLE ROCK, ARKANSAS MUFFLER FOR ENGINES Application filed January 6, 1930. Serial No. 418,844.

My invention relates to improvements in mufflers for internal Combustion engines, and generally to arrangements adapted to be connected with the exhaust of such engines.

The object of my invention is to provide an attachment for the exhaust pipe of engines that will absorb the energy of the exhaust gases so as to reduce the noise thereof to a minimum.

A further object of my invention is to provide means to permit the expansion of the exhaust gases to readily take place and to dispose of such gases without any back pressure into the exhaust'pipe of the engine, and to discharge said gases to atmosphere at a reduced temperature; and with these and other objects in view my invention consists of the parts and combination of parts here inafter pointed out.

In the drawings:

Figure l is a central longitudinal sectional view of my improved mufller.

Figure 2 is a sectional view on the line 22, Figure 1, looking in the direction of the arrows.

Figure 3 is a front elevation of one of the baffle plates.

Figure 4 is a sectional view on the line 1-4, Figure 1.

The reference numeral 5 designates the shell or body of the mufller, which may be corrugated as at 6 on its periphery, or may be provided with fins, the object of which is to facilitate heat radiation from the interior of the shell. 1

A conical chamber 7 is secured at the forward end of the body 5 terminating in a cylindrical end 8 designed for attachment to the exhaust pipe of the engine; said cylindrical end 7 functioning as an expansion chamber for the exhaust gases, the walls of such expansion chamber being abrupt. To the rear end of the expansion chamber is secured an outwardly d1shed,or conical like, plate 9 having an outturned flange 10 which is secured to the rear end of the expansion chamber, after which the chamber 7 is suitably secured in the forward end of the mufller body 5. The plate 9 is rovided with a central opening surrounde by an outturned flange 11. It will be noted 13. I secure in this jet tube 12a suitable numberof bafile plates 14, for instance two in number which are given a substantially spiral shape from end to end designed to give the gases from the chamber 7 a whirl-- ing motion, some of which gases pass from the tube 12 through ports 15 into the body 5 of the mufller, while other portions of the gases are discharged through the flaring end 13 of the tube into the body of the mufiler, and pass into the axial tube or equalizing chamber 16 to be hereinafter referred to.

' Suitable number of bafiie plates 17 having flanges 18 at their peripher adapted to bear against the inner face 0 the body 5 are rigidly affixed to the equalization chamber, and after the desired number of these baflies have been fixed to the chamber 16, it, with assembled baflles, are slid into the body 5 and ositioned therein as shown in Figure 1. f desired, a suitable damper 19 may be placed in the equalizing chamber 16 and is provided with an operating rod 20.

To the rear end of the body 5 I secure by bolts 31, or otherwise, a conical end ex tension 24 which is provided with a rearwardly extending outlet tube 22. Screw threaded to the rear end of the equalizing chamber 16 is a removable jet nozzle 23 which is of such diameter that when in position is spaced from the inner periphery of the sleeve 22 so that an annular space or orifice 25 is formed between it and the juncture of the sleeve 22 and extension 24. The size of this orifice is governed by the size of the interchangeable jet 23.

The bafiles 17 are provided with blades 26 which are struck up from the body of the bafiies and extend rearwardly therefrom, as

clearly seen in Figure 1.

The orts 15 are designed to be ositioned in con ormity with-the angle an direction of the spiral plates 14.

In operation the exhaust gases enter the chamber 7 where they are permitted to expand and from which they pass into jet tube 12 in which the gases are given a whirling motion, and some of the gases pass direct into the equalization chamber 16, while others pass through the ports 15 into the second expansion chamber 27 with a whirling motion which further expands the force of the gases. The gases from the chamber 27 pass through the openings 28 in the baffles 17 and infringeupon the blades 26, and as the openings 28 in one bafiie are staggered with reference to the next preceding baflie the gases are caused to flow from one baflie to the next in a whirling and spiral-motion, which tends to still further dissipate the force of the gases while the heat is to a material extent radiated through the body 5 and its radiators.

The gases passing through the equalization chamber cause a suction in the tube 22 at the dischar e end of the jet nozzle 23 which sucks t e gases from the body 5 through the annular space 25, thus the exhaust gases are discharged from the sleeve 22 substantially cool and with a minimum of noise.

What I claim is:

1. In combination, in an engine exhaust mufiler, a cylindrical body, an imperforated e ualizing chamber extending longitudinally o and within said body and spaced therefrom bafiies between the body and said chamber, an expansion chamber at the forward end of said body, a second expansion chamber adjacent the first named expansion chamber, and a perforated cylindrical open ended jet nozzle, extending from the first expansion chamber into the second expansion chamber. r

2. In combination, in an engine exhaust mufiler, a cylindrical body, an imperforated egualizing chamber extending longitudinally o and with said body and spacedtherefrom, baflies between the body and said chamber, an expansion chamber at the forward end of said body, a second expansion chamber adjacent the first named" expansion chamber, and a perforate cylindrical open ended jet nozzle, extending from the first expansion chamber into the second expansion chamber, and in axial alignment with the equalizing chamber.

3. In combination, in an exhaust mufiier for engines, a cylindrical body, an equalizing tube extending for a part of its length within said body, bafiles disposed between the said tube and the inner face of the body, ports in each bafile staggered relative to the ports in a succeeding baflle, an expansion chamber in said body in advance of and in constant open communication with said tube, the forward bafiie constituting the rear wall of said expansion chamber, means for connecting the body to an exhaust pipe, an

expansion chamber at the forward end of the body with which the forward end of said tube communicates and a cylindrical open ended perforate jet nozzle arranged between said second named expansion chamher and the said tube and projecting into the body immediately forward of and in axial alinement with said tube.

4. In combination, in an exhaust muflier for an engine, a cylindrical body, an equalizing tube extending for a part of its length within said body, bailies disposed between the tube and the inner face of said body, an expansion chamber in said body in advance of and in constant open communication with said tube, the forward baifle constituting the rear wall of said expansion chamber, a cylindrical perforate open ended jet nozzle extending into said expansion chamber in axial alignment with but spaced 'from the said tube, means for connecting saidjet nozzle with an exhaust pipe of an engine, an expansion chamber at the forward end of the body with which said tube communicates and into which the said nozzle projects, and a tapered discharge nozzle at the rear end of said tube.

5. In combination, in an exhaust mufller for an engine, a cylindrical body, an equalizing tube extending for a part of its length within said body, ported baffles disposed between' said tube and the inner face of the said body and having ports therethrough, the ports of one bafile being staggered relative -to the ports of the next ad acent baifie, an expansion chamber in the forward part of said body, and in constant open communication with said tube, the forward bafiie constituting the rear wall of said chamber, a second expansion chamber extending from the forward end of the said body and adapted for connection with the exhaust pipe of an engine, a third expansion chamber at the rear end of the body and in constant open communication with said tube, and a cylindrical perforate open ended jet nozzle opening at its rear end into the first-named expansion chamber and opening into the second-named expansion chamber with its rear end disposed adjacent to and in axial alinement with the forward end of the tube.

6. In combination, in an exhaust muffler for an engine, a cylindrical body, an equaliz ing tube extending for a part of its length within said body, spaced baflle disks disposed at right angles tothe tube and body between said tube and the inner face of the said body, and having ports therethrough formed by portions displaced therefrom in a rearward direction, the ports of one baflie being staggered relative to the ports of the next adjacent bafiie, an expansion chamber in the forward part of said body, and in constant open communication with said 9; Inanengineexhaust tube, the forward bafile constituting the rear wall of said chamber, a second expansion chamber extending from the forward end of the said body and ada ted for connection with the exhaust pipe 0 an engine, a third expansion chamber at the rearend of the body and in constant open communicationwith said tube, and a cylindrical perforate open ended jet nozzle opening at its rear end into the first named expansion chamber and o ening into the second-namedexpansion 0 amber with its rear end disposed adjacent to and in axial alinement with the forward end of the tube, and helical blades in said nozzle.

7. In an engineexhaust mufller, a cylindrical body, primary and final expansion chambers at opposite ends of the body, an equalizing tube extending longitudinally of the body with its rear end extending into the final expansion chamber and its forward end disposed in rear of the primary ex ansion chamber, a series of spaced bafile isks disposed between and at right angles to the tube and body and having radially arranged ports therein, the ports of adjacent. disks being staggered with relation to each other, an intermediate expansion chamber being formed in the body between the forward bafile disk and primary expansion chamber, a cylindrical perforate open ended jet nozzle communicating at its forward end with v the primary expansion chamber and projecting into the intermediate expansion chamber withits rear end in proximity to and in alinement with the forward end of the tube, and helical blades in said nozzle.

8. In an engine exhaust mufller, a cylindrical body,-primary and final ex ansion chambers at opposite ends of the y, a discharge outlet leading from the final expansion chamber, an eqtillalizing tube extendmg longitudinally of t e body with its rear end extending into the final expansion chamber and its forward end dis (1 in advance of the primar expansion 0 amber, a series of spaced b e disks disposed betweenvand at right angles to the tube and body and having radially arranged ports therein, the ports of adjacent disks being staggered with relation to each other, an intermediate exansion chamber being'formed in the body tween the forward baflie disk and primary expansion chamber, a.cylindrical perforate open ended 'et nozzle commumcatmg at its forward an with the. primary expansion fie disk and prime expansion ry n ended at nozzle drical body, primary and final expansion chambers at opposite ends of the bod an equalizing tube extendin longitudinally of the body with its rear en extending into the final expansion chamber and its forward end disposed in advance of the primary expansion chamber, a series of spaced bafiie disks disposed between and at right angles to the tube and body and having radially arranged ports therein, said ports being formed by rearwardly displaced portions of the disks, the ports of adjacent disks being staggered with relation to each other, an intermediate expansion chamber bein formed in the body between the forward be e disk and primary expansion chamber, a cylindrical perforate open ended jet nozzle communicating at its forward end with the primary expansion chamber and projecting into the intermediate expansion chamber with its rear end in proximity to and in alinement with the forward end of the tube, and helical blades in said nozzle.

. 10. In an engine exhaust mufiier, a cylindrical body, primary and final expansion chambers at opposite ends of the body, a discharge outlet leading from the final expansion chamber, an equalizing tube 'extendin longitudinallyof the body with its rear en extending into the final expansion chamber and its forward end disposed in advance of the primar expansion chamber, a series of spaced be e disks disposed between and at right angles to the tube andbody and having radiall arran ed ports therein, said ports being ormed y rearwardly displaced ortions of the disks, the ports of ad acent isks being staggered with relation to each other, an intermediate expansion chamber bein formed in the body between the forward ba chamber, a cylindrical perforate o communicating at its orward en P a, into the intermediate expans on chamber with its rear end. in proximi to and in alinement with the forward on of the tube helical blades in said nozzle, and a tapered discharge nozzle at the rear end of the tube extending into the discharge outlet of the final expansion chamber in spaced relation thereto.

In testimony whereof I aflix my signature.

ALFRED 'r. FLOYD, Jr.

with the chamber and projecting into the interme- I diate expansion chamber with its rear end in proximit to and in alinement with the forno ward en of the tube, helical blades in said nozzle, and a tapered discharge nozzle at the I rear end of the tube extendinginto the discharge outlet of the bar in spaced relation thereto.

final expansion chamexpansion chamber and projecting 

